Importance

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Abstract

A torque wrench structure comprising a reduction gear train within a case. The gear train includes an input shaft with an end accessible at the exterior of the case and an output shaft, a work engaging part at the exterior of the case concentric with the output shaft and coupling structure drivingly coupling the work engaging part with the output shaft. A reaction part with a body portion having a central opening freely accommodating said coupling structure is positioned adjacent the case. A plurality of circumferentially and radially spaced locking pins project from the body and engage in lock pin receiving structure in a part to be worked upon by the wrench. A plurality of circumferentially spaced elongate deflection beams project from the body and engaging stops on the case. Strain gauges are fixed to the deflection beams between the stops and the body. A bridge circuit with a digital readout is connected with the strain gauges to compare the resistance of said gauges and to display digits corresponding to the forces transmitted by the wrench through said work engaging part.

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First Claim